Sliding Door Roller, 4 Pcs Shower Rollers, Shower Runners, Roller Caster Wheel F Sliding Door Roller, 4 Pcs Shower Rollers, Shower Runners, Roller Caster Wheel For Shower Door Sliding Rollers Door Replacement Wheel(20mm) The product is shipped based on the color or size of the main image of the product page. Material: It is made of POM which combines high stiffness and strength with exceptional resilience, favorable sliding friction behavior and excellent dimensional stability, fuels and other fluids as well only at high temperatures. Brass shower door roller, and the screws are made of stainless steel, corrosion resistant, non-rusting, durable and have a long service life.Dimension: Roller Diameter: 20 mm/0.78 in; inner hole: 5 mm/0.19 in; Wheel Thickness: 5.5mm/0.21in; Screw length: 12mm/0.47 in.Component Rolling: Smooth door operation, slight forward or backward movement, effortless shower rollers for shower stalls, hydromassage boxes clearly perform their assigned task, distribute the mass glass, control movement in the given direction. This gives the product even more durability and a longer service life.Waterproof: When using a special ultra-waterproof grease with PTFE content for cabins shower, the service life of the wheels is much longer. It certainly works 100% to prevent problems, protects products from corrosion, creates a long-lasting water-repellent protective layer and helps mechanisms to prolong lifespan. Uses: Shower door rollers are what makes it easy to open the shower door, rollers for massage shower stalls, tubs, hot tubs and even for furniture trim.